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Spatially explicit decision support systems are assuming an increasing role in natural resource and conservation management. In order for these systems to be successful, however, they must address real-world management problems with input from both the scientiWc and management communities. The National Training Center at Fort Irwin, California, has expanded its training area, encroaching U.S. Fish and Wildlife Service critical habitat set aside for the Mojave desert tortoise (Gopherus agassizii), a federally threatened species. Of all the mitigation measures proposed to oVset expansion, the most challenging to implement was the selection of areas most feasible for tortoise translocation. We developed an objective, open, scientiWcally defensible spatially explicit decision support system to evaluate translocation potential within the Western Mojave Recovery Unit for tortoise populations under imminent threat from military expansion. Using up to a total of 10 biological, anthropogenic, and/or logistical criteria, seven alternative translocation scenarios were developed. The Wnal translocation model was a consensus model between the seven scenarios. Within the Wnal model, six potential translocation areas were identiWed.

Published by Chelonian Research Foundation 2 CHELONIAN RESEARCH MONOGRAPHS Contributions in Turtle and Tortoise Research CHELONIAN RESEARCH MONOGRAPHS (ISSN 1088-7105), founded in 1996, is an international peer-reviewed scientific publication series for monograph-length manuscripts, collected proceedings of symposia, edited compilations, and other longer turtle-related research documents. The series accepts contributions dealing with any aspects of chelonian research, with a preference for conservation or biology. Manuscripts or edited compilations dealing with conservation biology, systematic relationships, chelonian diversity, geographic distribution, natural history, ecology, reproduction, morphology and natural variation, population status, husbandry, and human exploitation or conservation management issues are of special interest. Bibliographic and other reference materials are also of interest. Submit proposals for publications directly to Anders G.J. Rhodin at the e-mail address above. Instructions for manuscript submission and detailed guidelines for authors are available at the same address.The series is published on an occasional basis by Chelonian Research Foundation and is available for purchase and/or downloading at www.chelonian.org. anders g.J. rhodin Chelonian Research Foundation, 168 Goodrich Street, Lunenburg, Massachusetts 01462 USA [RhodinCRF@aol.com] Christina M. Castellano, Anders G.J. Rhodin, Michael Ogle, Russell A. Mittermeier, Herilala Randriamahazo, Rick Hudson, and Richard E. Lewis, Eds. Chelonian Research Monographs (ISSN 1088-7105) No. 6, doi: 10.3854/crm.6 • © 2013 by Chelonian Research Foundation, Lunenburg, MA, USA • Published 30 October 2013 6 Decline in the range and population density of Radiated Tortoises, Astrochelys radiata, in southern Madagascar. Published Issues in the Series The Galápagos Tortoises Series Editor CHELONIAN RESEARCH MONOGRAPHS Turtles on the Brink in Madagascar: Proceedings of Two Workshops on the Status, Conservation, and Biology of Malagasy Tortoises and Freshwater TurtlestSilavo H. rafeliariSoa, ryan C. Christina M. Castellano, Anders G.J. Rhodin, Michael Ogle, Russell A. Mittermeier, Herilala Randriamahazo, Rick Hudson, and Richard E. Lewis, Eds. Chelonian Research Monographs (ISSN 1088-7105) No. 6, doi: 10.3854/crm.6 • © 2013 CONTRIBUTING AUTHORS Turtles on the Brink in Madagascar: Proceedings of Two Workshops on the Status, Conservation, and Biology of Malagasy Tortoises and Freshwater Turtles 10Turtles on the Brink in Madagascar • Chelonian Research Monographs, No. 6 -2013 Endemic tortoise and freshwater turtle species of Madagascar, depicted in approximate relative sizes. Status, Conservation, and Biology of Malagasy Tortoises and Freshwater Turtles Christina M. Castellano, Anders G.J. Rhodin, Michael Ogle, Russell A. Mittermeier, Herilala Randriamahazo, Rick Hudson, and Richard E. Lewis, Eds. Chelonian Research Monographs (ISSN 1088-7105) No. 6, doi: 10.3854/crm.6.a01p11 • © 2013 Madagascar, BP 851, 101 Antananarivo, Mad...

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